Kxowres —On Pre-historic Implements, &c. 109 
there is a great deal of material, one would say, wasted. In the 
other, the material is scarce, closely wrought up, and the manu- 
factured objects are small. The scrapers have different forms, some 
of them being broad at the scraping edge, some more or less pointed, 
while others are dressed to scrape in two directions, but the majority 
have a neatly-dressed circular edge. 
Of scrapers with concave scraping edge I obtained about fifty. 
These are generally made of large and good flakes. The majority have 
only one scraping edge, but a few have two or three dressed edges, of 
circular form, and occasionally we find the two kinds—that is, the con- 
vex and concave edge combined in one tool. Some of them are neatly 
serrated, and the hollowed scraping edge varies greatly in size. 
The diameter of the circle might be stated to vary from 14 inches 
to + inch. One is shown full size in Fig. 5. I got all those 
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which I found at Dundrum in three or four spots, about a dozen 
in each place. They would be found lying about within a few 
yards of each other. I imagined either that the tradesmen who 
wrought with these tools sat and worked in groups, or that the manu- 
facturers of them had made a lot while sitting in the same spot. It 
is imagined by some persons that these objects were used as saws, and 
they have obtained that name among collectors in Co. Antrim, but 
while some may have been used in that way, there are others totally 
unfitted for such a purpose. I am therefore inclined to believe that 
the chief use for which they were employed was the scraping of cylin- 
drical objects. I found three scrapers of this kind at Portstewart, but 
I never got one at Ballintoy. I also found two flat-edged scrapers. 
They differ in type from the ordinary flat-edged side scrapers, as the 
dressing is not carried out to the edge of the flake, but, like the hol- 
low scraper, the dressed part occupies a space in the centre. As these 
